Host software does not update the temperature value
repetier host v2.0.5 does not update the extruder and heater bed temperatures for Bluetooht Com connection.
Version 1.6.2 works with the same settings
Bluetooth or serial should not make a difference. Firmware must always send the same response on M104. So first question is what does firmware respond with in your case? See file log for the answer. Should contain something like T:xxx
Second question is which firmware are you using?